package com.fy.util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Map;
import javax.imageio.ImageIO;
import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;

/**
 * 二维码编码及解码工具类（使用Google的core.jar和javase.jar）
 * @author 小叶
 * @date 2016年2月23日
 * @version 1.0
 */
public class ZxingUtil {
	static String dir = System.getProperty("user.dir");
	private static final int BLACK = 0xff000000;
	private static final int WHITE = 0xFFFFFFFF;
	public static void main(String[] args) {
		/**
		 * 在com.google.zxing.MultiFormatWriter类中，定义了一些我们不知道的码,二维码只是其中的一种<br>
		 * public BitMatrix encode(String contents,
		                  BarcodeFormat format,
		                  int width, int height,
		                  Map<EncodeHintType,?> hints) throws WriterException {
		    Write      break;
		      case CODE_39:
		        writer = new Code39Writer();
		        break;
		      case CODE_128:
		        writer = new Code128Writer();
		        break;
		      case ITF:
		        writer = new ITFWriter();
		        break;
		      case PDF_417:
		        writer = new PDF417Writer();
		        break;
		      case CODABAR:
		        writer = new CodaBarWriter();
		        break;
		      default:
		        throw new IllegalArgumentException("No encoder available for format " + format);
		    }
		    return writer.encode(contents, format, width, height, hints);
		  }
		 */
		ZxingUtil test = new ZxingUtil();
		String filePostfix = "png";
		File file = new File(dir + "/WebRoot/img/Zxing." + filePostfix);
		test.encode("Hello World!", file, filePostfix, BarcodeFormat.QR_CODE, 5000, 5000, null);
		test.decode(file);
	}
	/**
	 *  生成QRCode二维码<br> 
	 *  在编码时需要将com.google.zxing.qrcode.encoder.Encoder.java中的<br>
	 *  static final String DEFAULT_BYTE_MODE_ENCODING = "ISO8859-1";<br>
	 *  修改为UTF-8，否则中文编译后解析不了<br>
	 * @param contents 二维码的内容
	 * @param file 二维码保存的路径，如：C://test_QR_CODE.png
	 * @param filePostfix 生成二维码图片的格式：png,jpeg,gif等格式
	 * @param format qrcode码的生成格式
	 * @param width 图片宽度
	 * @param height 图片高度
	 * @param hints
	 */
	public void encode(String contents, File file, String filePostfix, BarcodeFormat format, int width, int height,
			Map<EncodeHintType, ?> hints) {
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, format, width, height);
			writeToFile(bitMatrix, filePostfix, file);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	/**
	 * 生成二维码图片
	 * @param matrix
	 * @param format 图片格式
	 * @param file 生成二维码图片位置
	 * @throws IOException
	 */
	public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		ImageIO.write(image, format, file);
	}
	/**
	 * 生成二维码内容
	 * @param matrix
	 * @return BufferedImage
	 */
	public static BufferedImage toBufferedImage(BitMatrix matrix) {
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
		for (int x = 0; x < width; x++)
			for (int y = 0; y < height; y++)
				image.setRGB(x, y, matrix.get(x, y) == true ? BLACK : WHITE);
		return image;
	}
	/**
	 * 解析QRCode二维码
	 * @param file
	 */
	@SuppressWarnings("unchecked")
	public void decode(File file) {
		try {
			BufferedImage image;
			image = ImageIO.read(file);
			if (image == null)
				System.out.println("Could not decode image");
			LuminanceSource source = new BufferedImageLuminanceSource(image);
			BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
			Result result;
			@SuppressWarnings("rawtypes")
			Hashtable hints = new Hashtable();
			hints.put(DecodeHintType.CHARACTER_SET, "utf-8");// 解码设置编码方式为utf-8
			result = new MultiFormatReader().decode(bitmap, hints);
			String resultStr = result.getText();
			System.out.println("解析后内容：" + resultStr);
		} catch (Exception e) {
			System.err.println(e.toString());
		}
	}
}